Electromagnetic wave absorption properties of graphene modified with carbon nanotube/poly(dimethyl siloxane) composites |
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| Affiliation: | 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, West Youyi Rd., No. 127, Xi''an, Shaanxi, 710072, China;2. College of Materials Science & Technology, Shaanxi University of Science & Technology, Xi''an, Shaanxi, 710021, China;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, China;1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China;1. State Key Laboratory of Solidification Processing, Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an 710072, China;2. Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Kowloon, Hong Kong;3. Department of Physics, Aberystwyth University, Aberystwyth SY23 3FL, UK |
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| Abstract: | By using a catalytic growth procedure, carbon nanotubes (CNTs) are in situ formed on reduced graphene oxide (RGO) sheet at 600 °C. CNTs growing on RGO planes through covalent C–C bond possess lower interfacial contact electrical resistance. As a hybrid structure, the CNTs/graphene (CNT/G) are well dispersed into poly (dimethyl siloxane). The hybrid combining electrically lossy CNTs and RGO, which disperses in electrically insulating matrix, constructs an electromagnetic wave (EM) absorbing material with ternary hierarchical architecture. The interfacial polarization in heterogeneous interface plays an important role in absorbing EM power. When the filler loading is 5 wt.% and thickness of absorber is 2.75 mm, the minimum value of reflection coefficient and the corresponding frequency are ?55 dB and 10.1 GHz, and the effective absorption bandwidth reaches 3.5 GHz. Therefore, combining the CNTs and graphene sheet into three-dimensional structures produces CNT/G hybrids that can be considered as an effective route to design light weight and high-performance EM absorbing material, while the effective EM absorption frequency can be designed. |
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